A cold-rolled strip steel production unit and production process

Abstract

The present invention discloses a cold-rolled strip production unit, comprising a first lead coiler, a first strip coiler, a first clamping and straightening machine, a reversible rolling mill, a second clamping and straightening machine, a second strip coiler and a second lead coiler arranged in sequence; an adjacent first shearing machine and a first welding device are arranged upstream or downstream of the reversible rolling mill, and the first shearing machine and the first welding device are located between the first clamping and straightening machine and the second clamping and straightening machine; a first lead coil is arranged on the first lead coiler, and a second lead coil is arranged on the second lead coiler. The beneficial effects of the present invention are as follows: the present invention arranges a shearing machine and a welding device at the inlet and outlet of the reversible rolling mill respectively, welds the lead coils to the head and tail of the steel coil, and cuts off the lead coils after multiple reversible rolling passes. This production method reduces the head and tail cutting amount of the steel coil body and improves the production yield rate.

Description

Technical Field

[0001] The invention belongs to the technical field of rolling, and in particular relates to a cold-rolled strip steel production unit and a production process. Background Art

[0002] The existing cold-rolled strip production unit needs to coil multiple turns on the coiler before rolling, and then roll after tension is established, and tail rolling must be performed before each rolling pass. This production process has the following two problems: on the one hand, since the head and tail of the strip cannot be rolled during the rolling process and must be cut off when rolling is completed, and since there are many auxiliary equipment arranged on the inlet and outlet sides of the cold-rolled strip production unit, the distance between the coiler and the rolling mill is long, so the amount of strip head and tail cut off is large, resulting in a lower yield rate; on the other hand, during tail rolling, the tail of the strip will be separated from the coiler, causing the tension to disappear, resulting in a decrease in the thickness control accuracy when the tail of the strip is rolled, which is not conducive to obtaining a good quality of the tail of the strip. Summary of the invention

[0003] The purpose of the present invention is to provide a cold-rolled strip production unit and a production process to address the deficiencies in the prior art, thereby solving the problems of reduced yield due to excessive head and tail cutting in the production of strip by the existing cold-rolling units, and low control accuracy of the thickness of the tail of the strip due to unstable tension during tail-swinging rolling.

[0004] The technical solution of the present invention is: a cold-rolled strip production unit, comprising a first lead-belt coiler, a first strip coiler, a first pinch straightener, a reversible rolling mill, a second pinch straightener, a second strip coiler and a second lead-belt coiler arranged in sequence; an adjacent first shearing machine and a first welding device are provided upstream or downstream of the reversible rolling mill, and the first shearing machine and the first welding device are located between the first pinch straightener and the second pinch straightener; a first lead-belt roll is provided on the first lead-belt coiler, and a second lead-belt roll is provided on the second lead-belt coiler.

[0005] According to the above scheme, the first shearing machine and the first welding device are arranged between the first pinch straightening machine and the reversible rolling mill; the second welding device and the second shearing machine are arranged in sequence between the reversible rolling mill and the second pinch straightening machine.

[0006] According to the above scheme, a first speed measuring device is added between the first pinching and straightening machine and the first shearing machine; and a second speed measuring device is added between the second shearing machine and the second pinching and straightening machine.

[0007] According to the above scheme, a first weld detection device is arranged between the first strip coiler and the first pinch and straighten machine; and a second weld detection device is arranged between the second pinch and straighten machine and the second strip coiler.

[0008] According to the above scheme, a first pinch roller device is provided between the first lead-belt coiler and the first strip coiler; and a second pinch roller device is provided between the second lead-belt coiler and the second strip coiler.

[0009] According to the above solution, the first guide coil and the second guide coil are both steel coils, and the material of the steel coils is low-carbon steel.

[0010] The present invention also provides a cold-rolled steel strip production process based on the cold-rolled steel strip production unit as described above, the process comprising the following steps:

[0011] Step 1: The raw steel coil is uncoiled and led out from the first strip steel coiler, and the head of the steel coil is straightened and cut neatly, and then welded with the head of the second lead coil led out from the second lead coiler;

[0012] Step 2: The reversible rolling mill is pressed down, and the steel coil is first rolled between the first strip coiler and the second lead coiler;

[0013] Step 3: After the tail of the steel coil is straightened and cut neatly, it is welded to the head of the first lead coil drawn out from the first lead coiler;

[0014] Step 4: The reversible rolling mill is pressed down, and the steel coil is reversibly rolled in the middle pass between the first lead coiler and the second lead coiler;

[0015] Step 5: After the penultimate rolling pass is completed, the head of the steel coil is sheared from the welding position, led out and coiled onto the second strip coiler, and the second lead coil is coiled and retracted;

[0016] Step 6: The reversible rolling mill is pressed down to perform the final rolling between the first lead coiler and the second strip coiler;

[0017] Step 7: The tail of the steel coil is cut from the welding point and is coiled and recovered by the second strip coiler; the first lead coil is coiled and recovered.

[0018] According to the above scheme, the specific method of step one is: the first lead coil is fixed on the first lead coiler, the second lead coil is fixed on the second lead coiler, and the raw steel coil to be rolled is installed on the first strip coiler; the first strip coiler unwinds and leads the strip out, and at the same time the first pinch and straighten machine is pressed down, and the first shear is put into operation to straighten and shear the head of the raw steel coil in turn; when the head of the incoming steel coil reaches the second welding device, it stops moving forward, and at the same time the second lead coil on the second lead coiler is unwinded, and the second lead coil is led out, and the second lead coil enters the second pinch and straighten machine and the second shear in turn with the assistance of the second pinch roller device, and the second lead head is straightened and sheared neatly, and when the head of the second lead coil reaches the second welding device, it stops moving forward, and the second welding device welds the head of the incoming steel coil with the head of the second lead coil.

[0019] According to the above scheme, the specific method of step three is as follows: after the first rolling is completed, the reversible rolling mill is opened, the first pinch and straightening machine is pressed down, the first shearing machine is put into operation, and the tail of the incoming steel coil is straightened and sheared in sequence, and the tail of the incoming steel coil stops moving when it reaches the first welding device, and at the same time, the first lead roll on the first lead roll coiler is unwound, the first lead roll is led out, and with the assistance of the first pinch roller device, it enters the first pinch and straightening machine and the first shearing machine in sequence, and the first lead head is straightened and sheared in sequence, and the head of the first lead roll is stopped when it reaches the first welding device. The tail of the incoming steel coil is welded to the head of the first lead roll by the first welding device.

[0020] According to the above scheme, the specific method of step five is: after the penultimate rolling pass is completed, the reversible rolling mill is opened, first the second shearing machine is put into operation to cut the welding point between the steel coil and the second lead coil, then the second pinch roller device is pressed down, the second lead coiler is coiled, and the second lead coil is coiled and retracted, and at the same time the first pinch roller device is pressed down, the first lead coiler is uncoiled to lead out the strip, and with the assistance of the first pinch roller device, the head of the steel coil is led out and coiled onto the second strip coiler.

[0021] The beneficial effects of the present invention are:

[0022] (1) The present invention arranges a shearing machine and a welding device at the inlet and outlet of the reversible rolling mill, respectively, to weld the lead strips to the head and tail of the steel coil, and cuts off the lead strips after multiple reversible rolling passes. This production method reduces the amount of head and tail cuts of the steel coil body and improves the production yield rate.

[0023] (2) The leader coil in the present invention is always arranged on the leader coiler. After the production of the previous steel coil is completed, there is no need to load and unload the leader coil. The leader coil can be reused when the next steel coil is rolled, thereby improving production efficiency and reducing production costs.

[0024] (3) During each rolling process, the head and tail of the steel coil are connected to the coiler and are not separated from the coiler. The coiler always provides stable inlet tension and outlet tension, which is conducive to the precise control of the thickness of the entire length of the steel coil body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall layout of a specific embodiment of the present invention.

[0026] Figure 2 It is a schematic diagram of the present embodiment when the lead strip is welded to the head of the steel coil.

[0027] Figure 3 It is a schematic diagram of the first-pass rolling state of the steel coil in this embodiment.

[0028] Figure 4It is a schematic diagram of the embodiment of the present invention when the tail of the steel coil is welded with a lead strip.

[0029] Figure 5 It is a schematic diagram of the present embodiment in the middle-pass rolling state of the steel coil.

[0030] Figure 6 It is a schematic diagram of this embodiment when the steel coil head is in a shearing state.

[0031] Figure 7 It is a schematic diagram of this embodiment in the final rolling state.

[0032] Figure 8 It is a schematic diagram of this embodiment when the tail of the steel coil is sheared.

[0033] Among them: 1. the first lead-belt coiler; 2. the first lead-belt roll; 3. the first pinch roller device; 4. the first strip coiler; 5. the steel coil; 6. the first weld detection device; 7. the first pinch straightener; 8. the first speed measuring device; 9. the first shearing machine; 10. the first welding device; 11. the reversible rolling mill; 12. the second welding device; 13. the second shearing machine; 14. the second speed measuring device; 15. the second pinch straightener; 16. the second weld detection device; 17. the second strip coiler; 18. the second pinch roller device; 19. the second lead-belt coiler; 20. the second lead-belt roll. DETAILED DESCRIPTION

[0034] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] A cold-rolled strip production unit comprises a first lead coiler 1, a first strip coiler 4, a first pinch and straightener 7, a reversible rolling mill 11, a second pinch and straightener 15, a second strip coiler 17 and a second lead coiler 19 which are arranged in sequence; an adjacent first shearing machine 9 and a first welding device 10 are arranged upstream or downstream of the reversible rolling mill 11, and the first shearing machine 9 and the first welding device 10 are located between the first pinch and straightener 7 and the second pinch and straightener 15; a first lead coiler 2 is arranged on the first lead coiler 1, and a second lead coiler 20 is arranged on the second lead coiler 19; the first strip coiler 4 and the second strip coiler 17 are used for coiling and uncoiling the strip.

[0036] In the present invention, when the first shearing machine 9 and the first welding device 10 are arranged upstream of the reversible rolling mill 11, the first clamping and straightening machine 7, the first shearing machine 9 and the first welding device 10 are arranged in sequence; when the first shearing machine 9 and the first welding device 10 are arranged downstream of the reversible rolling mill 11, the reversible rolling mill 11, the first welding device 10, the first shearing machine 9 and the second clamping and straightening machine 15 are arranged in sequence.

[0037] Preferably, the first shearing machine 9 and the first welding device 10 are arranged between the first pinch straightening machine 7 and the reversible rolling mill 11; the second welding device 12 and the second shearing machine 13 are arranged in sequence between the reversible rolling mill 11 and the second pinch straightening machine 15.

[0038] Preferably, a first speed measuring device 8 is additionally provided between the first pinching and straightening machine 7 and the first shearing machine 9 ; and a second speed measuring device 14 is additionally provided between the second shearing machine 13 and the second pinching and straightening machine 15 .

[0039] Preferably, a first weld detection device 6 is arranged between the first strip coiler 4 and the first pinch and straightener 7 ; and a second weld detection device 16 is arranged between the second pinch and straightener 15 and the second strip coiler 17 .

[0040] Preferably, a first pinch roller device 3 is provided between the first lead-belt coiler 1 and the first strip coiler 4 ; and a second pinch roller device 18 is provided between the second lead-belt coiler 19 and the second strip coiler 17 .

[0041] In this embodiment, Figure 1 As shown, the cold-rolled strip production unit includes a first lead coiler 1, a first pinch roller device 3, a first strip coiler 4, a first weld detection device 6, a first pinch straightener 7, a first speed measuring device 8, a first shearing machine 9, a first welding device 10, a reversible rolling mill 11, a second welding device 12, a second shearing machine 13, a second speed measuring device 14, a second pinch straightener 15, a second weld detection device 16, a second strip coiler 17, a second pinch roller device 18 and a second lead coiler 19, which are arranged in sequence; the first lead coil 2 arranged on the first lead coiler 1 and the second lead coil 20 arranged on the second coiler 19 are both steel coils, and the material of the steel coils is preferably low carbon steel.

[0042] The various equipment involved in this embodiment, such as the coiler, the pinch roller device, the weld detection device, the pinch straightener, the speed measuring device, etc., are all common equipment in the field of strip rolling. This is the existing technology and will not be repeated here.

[0043] A cold-rolled steel strip production process based on the cold-rolled steel strip production unit as described above, the process comprising the following steps;

[0044] Step 1: The raw steel coil 5 is uncoiled and led out from the first strip steel coiler 4. After the head of the steel coil 5 is straightened and cut neatly, it is welded to the head of the second lead coil 20 led out from the second lead coiler 19.

[0045] like Figure 2As shown, first, the first lead coil 2 is fixed on the first lead coiler 1, the second lead coil 20 is fixed on the second lead coiler 19, and the raw material steel coil 5 to be rolled is installed on the first strip steel coiler 4; the first strip steel coiler 4 unwinds and leads the strip steel out, and at the same time, the first pinch and straighten machine 7 is pressed down, and the first shearing machine 9 is put into operation to straighten and shear the head of the raw material steel coil 5 in sequence; when the head of the incoming steel coil 5 reaches the second welding device 12, it stops moving forward, and at the same time, the second lead coil 20 on the second lead coiler 19 is unwinded, and the second lead coil 20 is led out, and the second lead coil 20 enters the second pinch and straighten machine 15 and the second shearing machine 13 in sequence with the assistance of the second pinch roller device 18, and the second lead head is straightened and sheared neatly, and when the head of the second lead coil 20 reaches the second welding device 12, it stops moving forward, and the second welding device 12 welds the head of the incoming steel coil 5 with the head of the second lead coil 20.

[0046] Step 2: First pass rolling of the steel coil.

[0047] like Figure 3 As shown, the reversible rolling mill 11 is pressed down, and the strip is first rolled between the first strip coiler 4 and the second lead coiler 19. During the rolling process, the first strip coiler 4 is in an uncoiling state, the second lead coiler 19 is in a coiling state, and the first pinch straightener 7, the first shearing machine 9, the first welding device 10, the second welding device 12, the second shearing machine 13, the second pinch straightener 15 and the second pinch roller device 18 are all opened offline.

[0048] Step 3: After the tail of the steel coil is straightened and cut neatly, it is welded to the head of the first lead coil 2 led out from the first lead coiler 1.

[0049] like Figure 4 As shown, after the first rolling is completed, the reversible rolling mill 11 is opened, the first pinch and straightening machine 7 is pressed down, and the first shearing machine 9 is put into operation, and the tail of the incoming steel coil 5 is straightened and sheared neatly in turn. When the tail of the incoming steel coil 5 reaches the first welding device 10, it stops moving forward. At the same time, the first lead coil 2 on the first lead coiler 1 is unwound, and the first lead coil 2 is led out. With the assistance of the first pinch roller device 3, it enters the first pinch and straightening machine 7 and the first shearing machine 9 in turn, and the first lead head is straightened and sheared neatly. When the head of the first lead coil 2 reaches the first welding device 10, it stops moving forward. The tail of the incoming steel coil 5 and the head of the first lead coil 2 are welded by the first welding device 10.

[0050] Step 4: intermediate rolling of the steel coil.

[0051] like Figure 5As shown, the reversible rolling mill 11 is pressed down, and the intermediate reversible rolling is performed between the first lead-belt coiler 1 and the second lead-belt coiler 19. During the rolling process, when the first lead-belt coiler 1 is in the unwinding state, the second lead-belt coiler 19 is in the winding state, and when the first lead-belt coiler 1 is in the winding state, the second lead-belt coiler 19 is in the unwinding state. The first pinch roller device 3, the first pinch straightener 7, the first shearing machine 9, the first welding device 10, the second welding device 12, the second shearing machine 13, the second pinch straightener 15 and the second pinch roller device 18 are all in the open offline state.

[0052] Step 5: The head of the steel coil is cut from the welding position, led out and coiled onto the second strip coiler 17.

[0053] like Figure 6 As shown, after the penultimate rolling pass is completed, the reversible rolling mill 11 is opened, and first the second shearing machine 13 is put into operation to cut the welding point between the steel coil 5 and the second lead coil 20, and then the second pinch roller device 18 is pressed down, and the second lead coiler 19 is coiled to retract the second lead coil 20, and at the same time, the first pinch roller device 3 is pressed down, and the first lead coiler 1 is uncoiled to lead out the strip, and with the assistance of the first pinch roller device 3, the head of the steel coil 5 is led out and coiled onto the second strip coiler 17.

[0054] Step 6: Final rolling of the steel coil.

[0055] like Figure 7 As shown, the reversible rolling mill 11 is pressed down, and the final rolling is performed between the first lead coiler 1 and the second strip coiler 17. During the rolling process, the first lead coiler 1 is in an uncoiling state, the second strip coiler 17 is in a coiling state, and the first pinch roller device 3, the first pinch straightener 7, the first shearing machine 9, the first welding device 10, the second welding device 12, the second shearing machine 13, the second pinch straightener 15 and the second pinch roller device 18 are all opened offline.

[0056] Step 7: The tail of the steel coil is sheared and taken back by the second strip coiler 17; the first lead coil 2 is taken back.

[0057] like Figure 8 As shown, after the last rolling pass is completed, the reversible rolling mill 11 is opened, and first the first shearing machine 9 is put into operation to cut the welding point between the steel coil 5 and the first lead tape coil 2, and then the first clamping roller device 3 is pressed down, and the first lead tape coiler 2 is coiled to rewind the first lead tape coil 2, and at the same time, the second strip coiler 17 is coiled to rewind the steel coil 5.

[0058] In the present invention, the first weld detection device 6 is used to detect the weld at the connection between the tail of the steel coil 5 and the head of the first lead coil 2, and the first speed measuring device 8 is used to detect the strip speed; when the first weld detection device 6 detects the weld, the reversible rolling mill 11 decelerates and stops, and under the control of the precise speed measurement and speed control system of the first speed measuring device 8, the weld at the connection between the tail of the steel coil 5 and the head of the first lead coil 2 is accurately stopped near the first shearing machine 9, preparing for subsequent shearing or subsequent rolling. The second weld detection device 16 is used to detect the weld at the connection between the head of the steel coil 5 and the head of the second lead coil 20, and the second speed measuring device 14 is used to detect the strip speed. When the second weld detection device 14 detects the weld, the reversible rolling mill 11 decelerates and stops, and under the control of the precise speed measurement and speed control system of the second speed measuring device 14, the weld at the connection between the head of the steel coil 5 and the head of the second lead coil 20 is accurately stopped near the second shearing machine 13, preparing for subsequent shearing or subsequent rolling.

[0059] The present invention welds the lead tape to the head and tail of the steel coil at the inlet and outlet of the unit respectively, and then cuts off the lead tape after multiple reversible rolling, thereby reducing the head and tail cutting amount of the steel coil body and improving the yield rate. After the steel coil is produced, there is no need to load and unload the lead tape roll, and the lead tape roll is always kept on the lead tape coiler and can be reused, thereby improving production efficiency. During each rolling process, the head and tail of the steel coil are always connected to the coiler and are not separated from the coiler, which can ensure that the coiler always provides stable inlet tension and outlet tension, which is conducive to the precise control of the thickness of the entire length of the steel coil body.

[0060] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cold-rolled steel strip production unit, characterized in that: The invention comprises a first lead-belt coiler, a first strip steel coiler, a first pinch and straightener, a reversible rolling mill, a second pinch and straightener, a second strip steel coiler and a second lead-belt coiler which are arranged in sequence; an adjacent first shearing machine and a first welding device are arranged upstream or downstream of the reversible rolling mill, and the first shearing machine and the first welding device are located between the first pinch and straightener and the second pinch and straightener; a first lead-belt roll is arranged on the first lead-belt coiler, and a second lead-belt roll is arranged on the second lead-belt coiler; The first shearing machine and the first welding device are arranged between the first pinch straightening machine and the reversible rolling mill; the second welding device and the second shearing machine are arranged in sequence between the reversible rolling mill and the second pinch straightening machine; A first speed measuring device is added between the first pinching and straightening machine and the first shearing machine; a second speed measuring device is added between the second shearing machine and the second pinching and straightening machine; A first weld detection device is arranged between the first strip steel coiler and the first pinch and straightener; a second weld detection device is arranged between the second pinch and straightener and the second strip steel coiler; The first weld detection device is used to detect the weld at the connection between the tail of the steel coil and the head of the first lead coil, and the first speed measuring device is used to detect the speed of the strip; When the first weld detection device detects the weld, the reversible rolling mill slows down and stops, and under the control of the first speed measuring device, the weld at the connection between the tail of the steel coil and the head of the first lead coil is stopped at the first shearing machine, in preparation for subsequent shearing or subsequent rolling; the second weld detection device is used to detect the weld at the connection between the head of the steel coil and the head of the second lead coil, and the second speed measuring device is used to detect the speed of the strip. When the second weld detection device detects the weld, the reversible rolling mill slows down and stops, and under the control of the second speed measuring device, the weld at the connection between the head of the steel coil and the head of the second lead coil is stopped at the second shearing machine, in preparation for subsequent shearing or subsequent rolling.

2. The cold-rolled steel strip production unit according to claim 1, characterized in that: A first pinch roller device is provided between the first lead-belt coiler and the first strip steel coiler; and a second pinch roller device is provided between the second lead-belt coiler and the second strip steel coiler.

3. The cold-rolled steel strip production unit according to claim 1, characterized in that: The first leader coil and the second leader coil are both steel coils made of low-carbon steel.

4. A cold-rolled steel strip production process based on the cold-rolled steel strip production unit as claimed in claim 2, characterized in that: The process comprises the following steps; Step 1: The raw steel coil is uncoiled and led out from the first strip steel coiler, and the head of the steel coil is straightened and cut neatly, and then welded with the head of the second lead coil led out from the second lead coiler; Step 2: The reversible rolling mill is pressed down, and the steel coil is first rolled between the first strip coiler and the second lead coiler; Step 3: After the tail of the steel coil is straightened and cut neatly, it is welded to the head of the first lead coil drawn out from the first lead coiler; Step 4: The reversible rolling mill is pressed down, and the steel coil is reversibly rolled in the middle pass between the first lead coiler and the second lead coiler; Step 5: After the penultimate rolling pass is completed, the head of the steel coil is sheared from the welding position, led out and coiled onto the second strip coiler, and the second lead coil is coiled and retracted; Step 6: The reversible rolling mill is pressed down to perform the final rolling between the first lead coiler and the second strip coiler; Step 7: The tail of the steel coil is cut from the welding point and is coiled and recovered by the second strip coiler; the first lead coil is coiled and recovered.

5. The cold-rolled steel strip production process according to claim 4, characterized in that: The specific method of step one is: the first lead coil is fixed on the first lead coiler, the second lead coil is fixed on the second lead coiler, and the raw steel coil to be rolled is installed on the first strip coiler; the first strip coiler unwinds and leads the strip out, and at the same time the first clamping and straightening machine is pressed down, and the first shearing machine is put into operation to straighten and shear the head of the raw steel coil in turn; when the head of the incoming steel coil reaches the second welding device, it stops moving forward, and at the same time the second lead coil on the second lead coiler is unrolled to lead the second lead coil out, and the second lead coil enters the second clamping and straightening machine and the second shearing machine in turn with the assistance of the second clamping roller device, and the second lead coil is straightened and sheared neatly, and when the head of the second lead coil reaches the second welding device, it stops moving forward, and the second welding device welds the head of the incoming steel coil with the head of the second lead coil.

6. The cold-rolled steel strip production process according to claim 4 or 5, characterized in that: The specific method of step three is: after the first rolling pass is completed, the reversible rolling mill is opened, the first pinch and straightening machine is pressed down, and the first shearing machine is put into operation to straighten and shear the tail of the incoming steel coil in turn. When the tail of the incoming steel coil reaches the first welding device, the steel coil stops moving forward. At the same time, the first lead roll on the first lead roll winder is unwound, the first lead roll is led out, and with the assistance of the first pinch and straightening roller device, it enters the first pinch and straightening machine and the first shearing machine in turn to straighten and shear the head of the first lead roll. When the head of the first lead roll reaches the first welding device, the steel coil stops moving forward. The tail of the incoming steel coil is welded to the head of the first lead roll by the first welding device.

7. The cold-rolled steel strip production process according to claim 6, characterized in that: The specific method of step five is: after the penultimate rolling pass is completed, the reversible rolling mill is opened, first the second shearing machine is put into operation to cut the welding point between the steel coil and the second lead coil, then the second pinch roller device is pressed down, the second lead coiler is coiled, and the second lead coil is coiled and retracted, and at the same time the first pinch roller device is pressed down, the first lead coiler is uncoiled to lead out the strip, and with the assistance of the first pinch roller device, the head of the steel coil is led out and coiled onto the second strip coiler.

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